Question
Mathematics Question on Random Experiments
Three rotten apples are mixed accidently with seven good apples and four apples are drawn one by one without replacement. Let the random variable X denote the number of rotten apples. If μ and σ2 represent mean and variance of X, respectively, then 10(μ2+σ2) is equal to
A
25
B
250
C
30
D
20
Answer
20
Explanation
Solution
The correct answer is 20